Appendix B. Application Reference

Applications are the core functionality of the dialplan. Generally these all will operate on the channel, whereas functions, described in Appendix F, merely return values that can be used by applications. There are a few applications that still simply return values, but these will probably be deprecated in a future version and replaced with dialplan functions.

There are a few things to keep in mind about applications. First, when they exit, they will either terminate normally or abnormally. Abnormal termination almost always occurs when an application detects that the channel has hung up (or if it doesn’t, the dialplan will detect that shortly thereafter). An application may also exit abnormally when it wishes to indicate to the dialplan that some condition has not been satisfied and that it should force a hangup. In all other cases, an application will exit normally, which indicates that processing should continue at the next priority in the dialplan.